crab ideas?

[sparks56]

setting up a new 120 gal with new lr and yesterday
noticed a crab like i've never seen b4! it has 2 claws on larger arms and 2 more arms that have these fan like ends and it is in a steady motion of pulling these fanlike hands to his mouth from the water column. can't see his body or take pix. anyone out there have any ideas?/ good or bad crab? thanks!!

 

[romunov]

Porcelain crabs. They're related to hermit crabs, actually.

 

[Javeo]

As romunov said Porcelain crabs, not at all harmful. I find them very interesting and have a few,both free living and anemone hosting types. But like most filter feeders you will need to feed them to keep them alive, cyclopeeze and mysis are great.

 

[sparks56]

thanks guys!!!